You should use 2.4.3 of pidgin of Ubuntu 8.04 backports:
version 2.4.3 (07/01/2008):
libpurple:
* Yahoo! Japan now uses UTF-8, matching the behavior of official clients
and restoring compatibility with the web messenger (Yusuke Odate)
http://www.pidgin.im/ChangeLog
** Changed in: pidgin (Ubuntu)
Status: New => Confirmed
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login into Yahoo Japan fails
https://bugs.launchpad.net/bugs/243107
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